Adjustable reamer



D. R. GALLAGHER.

ADJUSTABLE REAMEH.

APPLICATION FILED MAR. 2,1920. 1 14 5 1 Patented May 2, 1922.

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[nzren to? D. R. GALLAGHER.

ADJUSTABLE REAMER.

APPLICATION man MAR. 2. 1920.

Patented Ma 2, 1922.

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DAVID R. GALLAGHER, OE TROY, NEW YORK.

ADJUSTABLE MARKER.

To all whom it may concern:

Be it known that 1, DAVID R. GALLAGHER, a citizen of the United States, residin at Troy, in the county of Rensselaer and tate of New York, have invented new and useful Improvements in Adjustable Reamers, of which the following is a specification.

Reference may be had to the accompanying drawings, and the reference characters marked thereon, which form a part of this specification. Similar characters refer to similar parts in the several figures therein.

This invention is applicable to reamers of various kinds, and is particularly adapted for reamers for use in reboring cylinders of gas-engines and the like.

Certain objects of the invention are to provide for a high degree of accuracy in the dimensions of the bore formed by the reamer; to accurately pilot or guide the cutting mechanism, and to prevent or reduce vibration of the cutters; and to securely maintain the cutting and pilot mechanisms in adjusted position during the operation of the device.

Other objects will appear in connection with the following description.

Fig. 1 of the drawings is a view in front end elevation partly broken-away and shown in cross section of a reamer embodying my invention.

Fig. 2 is a view in side elevation of the same partly broken-away and shown in sectlon.

Fig. 3 is a view in the same.

Fig. 4 is a view in cross-section through the cutter-head taken on the broken line 44 in Fig. 2.

-Fig. 5 is a central lon 'tudinal section of the same taken' on the roken line 55 in Fig. 1.

Fig. 6 is a cross-section through the cutter-head taken on the broken line 6--6 in Fig. 5. I

Fig. 7 is a plan view of the outer end of one of the cutters detached.

Fig. 8 is a view in side elevation of the same. h

Fig. 9 is a view in elevation of the righthand edge of the same as shown in Fi 8.

Fig. 10 is a view in side elevation o the adjustable gageadapted for use in connection with the tool above described for accurately adjusting the cutters and pilot blocks and plates.

rear end elevation of Specification of Letters Patent.

Patented May 2, 1922.

Application filed March 2, 1920. Serial No. 882,582.

Fig. 11 is a view in elevation of the same as seen from the right-hand side of Fig. 10.

.tending inwardly through its peripher ,said

openings being adapted to receive an form slideways for the respective cutters, 3, which are thus mounted upon the cutter-head with provision for adjustment inwardly and outwardly with respect to the axis of the head.

As a means for adjustably moving the cutters, 3, inwardly and outwardly in their respective slideways, 2, I mount upon the cutter-head at one side of each .of said cutters and parallel therewith a screw, 4, adapted to freely rotate within a plain bored hole, 5, extending inwardly through the periphery of, the cutter-head, which screw is prevented from longitudinal movement, while permitted to freely rotate, by means of a pin, 6, inserted through a portion of the cutter-headv in engagement with a circumferential-groove, 7, on the inner end of said screw.

The neighboring portion, 8, of the cutter is formed with segments of screw-threads adapted to engage the threaded portion of the screw, 4, whereby rotative movements of the screw, 4, in opposite directions will cause inward and outward movements of the cutter in its slideway.

Each cutter, 3, is fixedly secured in ad justcd position by means of a wedge, 9, which wed e with its shank, 10, occupiesa longitudina opening, 11, extendin through the rear end of the cutter-head an through the flange, 12, on a shaft, 13, which carries the cutter-head.

The outer end of the shank, 10, of the wedge is screw-threaded to fit a nut, 14, en; gageable with the outer side of said flange, 12, by means of which nuts, the wedges, 9, can be drawn into tight engagement with the respective adjusted cutters, and which nuts also serve to secure the cutter head to said flange, 12.

The wedge, 9, and the shank, 10, are of general circular form in cross-section with the wedge portion slightly flattened where it engages the cutter as shown more particularly in Fi 6.

In rear of t e cutters, 3, the cutter-head is formed with a plurality of longitudinal peripheral slots, 15, each of which contains 53 argest a slidable wedge-plate, 16, and a pilot-plate, 1?, These plates have wedgewise engaging surfaces as shown, and the wedge-p rate, it, has a screw-threaded shanh, 18, extending out through an aperture in the tlange, 1.52, which shanh is engaged by a nut, 19, rotatively mounted in said aperture said flange wherehy inward and outward sliding movements can be imparted to the wedgeplate, M5, by rotative movements or said nut.

Slide movements thus imparted to the wedge-plate, it, cause the pilot plate, 17, to he forced more or less out of the slot beyond the periphery of the cutter-head.

The pilotplate, l7, and wedge-plate, 16, are yieldingly held together with their wedgewise-engaging surfaces in contact with one another by means of a hoit, 20, inserted through the piiot-plat/e and through a slot, 21, in the wedge-plate, the end or said bolt having on its inner end a nut, 22, with a coil-spring, 23, confined between said not and a bushing, 39, screwed into an aperture, d0, termed in the cutter-head to receive said bolt and spring.

The pilot-plate, i7, is fixedly secured in adjusted position by means of a split or divided wedge, 24:, and a wedge-shaped screw, 25, whereby one member of the divided wed e is driven into firm engagement with the pilot-plate.

A pilot-head, 26, is removabiy mounted upon the front end of the cutter-head, 1, by means of screws, 27,

This pilot-head is provided with a plurality of siideway-openings, %8, extending inwardly through the periphery of the piiothead, each adapted to receive and term a close-fitting slidewaytor a pilot-block, 29, interiorly screw-threaded to receive a screw, 30, which screw is mounted upon the pilothead by means of a pin-and-groove similar to the pin, it, and groove, 7, whereby longitudinail movement of the screw is prevented while the screw is permitted to freely rotate.

By rotation of the screw, 30, in opposite directions the pilot-block, 29, can be adjustably moved inwardiy or outwardly to project more or iess out of the opening 28, be end the periphery of the pilot-head, s The pilot-block, 29, is fixedly secured in adjusted position by means of a divided wedge, 31, and wedge-shaped screw, 32, whereby one member'ot the wedge can be driven into firm engagement with the adjusted pilot-block.

The position of the pilot-head upon the cutter-head is accurately determined by engagement of a central boss, 33, on the pilothead with a central bearing-opening, 34, formed upon the front end of the cutterhead.

The cutter-head has mounted thereupon a micrometer-screw, 35, fitting a screw-threaded opening extending inwardly through the periphery of the cutterhead, the outer end oi said micrometer-screw being adapted to project more or less beyond the periphery oi the cutter-head,

The outer end of this micrometer-screw is preferably caiihrated to accurately indicate the distance from the axis of the cutter-head to the outer-most surface of said screw,

The bearing-aperture, 3a, in the front end ot the cutter-head is adapted to form a bearing to receive a gage, 36, shown detached in Figs. l0lli, which gage can be rotatively moved in said bearing to bring the gage op= posite each of the respective cutters, 3, and each ot the piiot-plates, 17, to assist in accurate adjustment of the cutters and pilotplates to the diameter of bore desiredw in using said gage for adjusting the cutters, 3, and pilot-plates, 17, the micrometerscrew, 35, is first adjusted tor the desired diameter of bore. The gage, 36, is then mounted upon the cutter-head in connection with the bearing, 34, the pilot-head, 26, having been removed, and said gage is then adjusted accurately with respect to said mi crometer screw The gage can then be swung from one to another of the cutters, 3, and pilot-plates, 17, each of which is accurately adjusted with respect to the gage and thus with respect to the diameter indicated by the micrometer-screw,

The outer end of the pilot-head, 26, is provided with a bearing-opening, 3?, similar to the hearing-opening, 34:, in the cutterhead with which bearing-opening, 37, said 7 gage, 36, is adapted to cooperate in the accurate adjustment of the pilot-blocks, 29; in substantially the same manner that it coopcrates with the bearing-opening, 3%, in the cutter-head in adjusting the cutters and the pilot-plates, 17.

i The device with its parts properly adjusted in the manner above described is used in the ordinary manner of a reamer or the like, the adjusted pilot-blocks, 29, facilitating the insertion of the reamer into the bore of the cylinder to be rebored or any similar generally cylindrical opening, and as the device passes within the cylinder, the pilot-plates, l7, cooperate with the pilotblocks, 29, to steady the reamer. and prevent undue vibration or chattering of thecutters, and to guide the reamer in a straight path.

The mechanisms above described provide for a high degree of accuracy in the adjustment of both the cutters and the pilot mechanisms, while the severai parts are readily accessible for adjustment and removable for re air.

have shown the pilot-blocks, 2 of general circular form in cross-section, each block however having a flattened surface, 38-, for engagement with the neighboring member of the divided wedge, 31.

T have also shown the axis of the wedge,

1. In a device of the class described and.

in combination, a head; a cutter mounted upon the head with provision for adjustment toward and from the axis of the head, said head being provided in its end with a centrally located bearin adapted to receive a gage whereby the pro ection of the cutter can be accurately determined; and a gage having a member rotatably seatable in said bearing.

2. In a device of the class described and incombination, a head; a lurality of cutters mounted upon the head with provision for separate adjustment of each cutter toward and from the axis of the head, said head being provided in its end with a centrally located bearing adapted to receive a gage whereby the projection of the cutters can be accurately determined; and a gage having a member rotatably seatable in sa1d bearing.

3,;I n'a device of the class described and in combination, a cutter-head; cutters ad'ustably mounted upon the cutterhea a pilot-head having pilot-members ad ustably mounted thereupon; said cutter-head and said pilot-head being each provided with a central bearing adapted to receive a gage whereby the projection of the cutters can be accurately determined with respect to the axis of the cutter-head, and the projection of the pilot-members can be accurately determined with respect to the axis of the pilot-head, said pilot-head having means for engagement with said bearing on the cutterhead whereby the pilot-head can be removably mounted upon the cutter-head.

4. In a device of the ciass described and in combination, a head provided,with longitudinal slots in its periphery; pilot-mechanism mounted within the respective slots, comprising an inner wedge-plate and an outer pilot-plate, said plates having wedgewise engaging surfaces; screw -mechanism for adjustably moving one of said plates relatively to the other; spring-mechanism for holding said wedgewise-engaging surfaces in engagement with one another; and means for fixedly securing said pilot-plate in adjusted position.

5. In a device of the class described and in combination, a head provided with longitudinal slots in its peri hery; pilot-mechanism mounted within.t e respective slots, comprising an inner wedge-plate and an outer pilot-plate, said'plates having wedgewise engaging surfaces; screw mechanism for adjustably moving said wedge-plate relatively to said pilot-plate; a screw-bolt extending through said pilot-plate and through a slot provided therefor in said wedge-plate; a nut on said bolt; a spring confined between said nut and said head; screw-mechanism for adjustably moving said wedge-plate relatively to said pilot-plate, and a screw-actuated wedge for fixedly securing said pilotplate in adjusted position. i

6. In a device of the class described and in combination, a cutter-head; cutters mount ed thereupon with provision for adjustment toward and from the axis of the cutter-head; and a micrometer-screw adjustabl mounted upon said cutter-head, said cutteread being provided with a central end-bearing ada ted to receive a gage for the accurate ad ustment of said cutters with respect to said micrometer screw.

In testimony whereof, I have hereunto set my hand this 23rd day of Februar 1920.

DAVID R. GALLA HER. 

